Oscillating safety-switch.



H. S. TITTLE.

OSCILLATING SAFETY SWlTCH.

APPLICATION FILED NOV. 16, ms.

Patented Sept. 10,1918.

If V H. 4, E13

' fiTTORNEY.

H. 8. mm.

OSCILLATING SAFETY SWITCH.

APPLICATION FILED NOV. 15. I916.

Patented Sept. 10, 1918.

INVENTORK In: non-ms PlYlu m. Pnamunve, Minerva. a c,

UNITED STATES PATENT OFFICE.

HORATIWS. TiT'T'LkOFSA'N Fi'mNCIseo; cxtirbmr'iaf OSCILLATING SAFETY-SWITCH.

Patenteu sept. 1641918:

Ap licaton filed Nevember lef'li'." sri'l N31 1312776.

1,: 1.7. ,1 4 otSan l ranclsco, State of Callfol rl fiu, have inveii'ted' 4 a new and uselffil Oscillating" This invention reletes to an esc illg tting safety sW1teh for use 111 startlng motors Where a very heavy stz'u'ting es -rent is requ u'ecl, and after Whmh the sw1teh 1s placed;

-aietus will have euiitent Figfure' l is avertieal seetionahvie'w of the machine; I t I Fig; Q is a, plan View of the machine.

is a side elevatieli' of thecdmplem" ni'ziclhinef Fig'l 5 is a side 'elevzttieii of one of the fritlfies. I

Fig. 61s a vertical seetioiial thieu'gh thd'swith blac le holding eylinder; and

Fig.7 is a, detailed view'of olieof the fibef' blocks l'lol'di ng the eohtaet points.

Thehlinne'r'z'tl "1 ilidieat'es a suitable 'box hztviiig sides 2, 2;,4Jehd 5 WltI1 cover which is hinged 'to the side 4. The swit'eh'c'oin prisesti ve fy lm'e'slf sgwhi'e h havef il b werdlyiprejeeting slotteil lugs 9 and 10 fer' securing the fiise' block; 11 in plalce; said. fuse block ca'ri'yhj g a' fuse fer eachlofi the Wiifs f een'heeting" with tl1e eleet1fiea1 eppa'lfatl'ls}; in the 'presel it instance three" Wires beihg 'used, ahd'the' fus'e'lol'oelg'having a'fuse" for ete'h of them. The frames eaeh consist of"; 'b'ese: memter'fle, upright "pest l3, 2 in} clined posts 14;,'15,t0 whieh ai erespeeti ye cori'neeted wo eppesi'teh inclined posts' lfi, alia 17; whiti h etrfy hoflzofitatlibaQrsIIS, 1 eitei ilihg'from ee eh othe'i, ahd which al e ediihete'cl 'tq a vertical lpost split to p lovide two ,bars 21; 22, sd'that s cillating Swi eli .ibl'aae arry ng} meets-138m" caii be" plaeei ih' pesitieii' fren'f the U51) eftkgf cei fipletelyj asseiiibledi The tizvb frames'i'i' ei1d'8 hits their 14; ti 17 'ineltisive ee'riheetel together by i rie iiiis of fflul"eshesti is libel p r ethei instiletui ig Q material hers 22f), wi l. be bd ie t the i ms v nieei'ls bf silita l'e sei'ews, the 'Pfes'eht swite? being ineeqaea o'handlemrs'wi cig uig; as'fee'eh of fnetehed tQreeei e the spring contact I points 27; 28; 29, which: e0n tzie't pfiiiits a ie seet i'ec'imhiei'etolby'niealns f sljiteble gaf w thfeugh-th fiber and thei are tyre ether notches in eiteh bloe]; ir idieat'diat 30","31; o reeive thqb'amerg be; the s v'iriteli' blafleg Each of t the frziine's] '7 end 8 is pfetf idd withlaljl" ohtj whidlj eithdi'ligHenge lat' 32, which pro? between a pair of blocks 38, 39, grooved as indicated at 40 to receive the switch blade and provided with three holes, 41, 42, 43. Th holes 41, 43 receive bolts 44, 45, which pass through plates 46, 47, and through the several. disks making up the switch blade carrying member, there being three disks 38, three of the disks 39 oppositely placed in pairs, and two guard disks or barrier disks 50, 51, mounted on opposite sides of the knife blade 36, and between it and the adjacent switch blades 35, 37. A rod 52 of insulating material such as fiber or any other material of that character passes through the center of the several disks and through a hole in each of-the switch blades for the purpose of hold-v ing said 'switch'bla-des in a fixed position with respect to the member carrying them. Bearing caps 53 hold the shafts 33- and 34 in their proper position and allow the knife carrying mechanism to oscillate sufficiently for the purpose to be presently explained. Mounted on the shafts 83, 34, are two short levers 55, 56, which are rigidly connected. with said shafts, and which have holes there in to receive hooks on the ends of the two spiral springs 57, 58. The spiral springs are connected at their upper ends to an outwardly turned hook 59 connected with a plate 60, which is bolted to the top of the two frames, there being two of said spring holding horns oppositely placed. The shaft 34 is long enough to project through the side 4 of the inclosing casing, and it has a lever 61 connected therewith, which lever is used for the purpose of oscillating the switch blades from the starting position to the running position as may be desired. In order to secure the switch in the running position, it is provided with a stiff sprin 62 which is connected with the shaft 34 and extends along one side of the lever 61 and terminates in a handle 63, said handle being connected with the spring by means of the bolt 64, which also extends through the lever 61, a'nd'is again connected with the spring 62 at 65." This spring-affords means for'stopping the lever 61 when the lever is rotated to the starting position by having said spring come against the projecting stop. 66 on the side/4 of the inclosing'casing. In the running position the lever is turned down to the position shown in Fig. 1 and the spring 62 is thenengaged with 'the swing-- ing latch 67, which latch is pivoted to a spring'pres's stud 68 normally held in a position to disengage, the latch from the spring by the spiral spring 69. .At the lower end of the latch'67f'there is a projecting-lug 70 which engages an opposltely placed latch 71 on the upper end of the armature 72 passing into 'the'coil 73,".t-he. object of the following construction being to'provi de means whereby the latch 67 will he held in the position shown in Fig. 2 only when current is passing through the coil 73, the weight of the armature at other times causing it to be disengaged from the-latch. In order to secure the handle of the switch in the inoperative position, the box has a projecting boss 74 with an opening therein to receive the end of a screw 75, and said screw may be operated only with a particular type of key. Since the switch is to be installed in a place where it cannot be tampered with by unauthorized persons, the box with the sides and top illustrated is made use of, and the top is provided with an L shaped arm 77 which bears upon one end of the pin 68 when the cover is closed, thereby holding the latch 67 in the proper posi tion to hold the lever 61 with the switch blades engaged with the contact points for the running position through the fuse blocks. When the box is opened by the person in chargdthereof, the act of opening it will release the latch 67 and thereby bring the switch blades to the neutral position. The electric supply cables are connected with the switch as illustrated in Fig. 4 in which 80 indicates the supply wire, 81 the wire connecting one of the contact points on each insulating bar with a point on the next adjacent bar, 82 indicates a cable connecting one of the switch points on one of the insulating bars with one end of the fuse block, 83 a cable connecting the other end of the fuse block with one of the contact points on the next adjacent lower bar, while a wire 84 connects the contact points on the lower bar with the apparatus to be operated. The operation of this switch is as follows :Assuming a motor or other piece of electrical apparatus to be started by closing the switch, the. operator 'first turns the handle to the right, Fig. 4, only the contact blades of the movable member connecting the contact points A and B of the entire series, see Fig. 4. As soon as this contact has been made, current will be delivered to the apparatus being started from the main line 80 of the line 84 without'the interposition of the fuses. As soon as theim'otor orother apparatus is started the switch lever will be pushed to the left, Fig. 4,"so that it is engaged by the latch 67 as illustrated in Fig. 2, whereupon the switch blades will connect the contact pointsC and D of the entire series, in which event current will be delivered from the feed wire 80 to the wires 84 after having passed through the connections in the fuse block, and so long as current remains on, the coil 73 will hold the lever in the engaged position, but as soon as the current goes off the latch 67 will be released and the lever 61 will turn to the neutral posit-ion. It is to be noted that in the starting, thestop' 66 determines the" position to which the switch handle shall be turned, but does not provide means to holdit in thatposition, but as 

